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My 510 was a semi race car so had a roll cage and 4 point harnesses that were fastened to the cage.
I am now reversing that process and trying to fit after market seat belts.
I need to bolt the top part to the upright between the doors but there seems to be no bolt holes.
Where was the original seat belts connected to?

So an update. The Datsun is a RHD, I check the levels on the master cylinders with difficult but its possible.
I got a remote brake booster from a BMW 3 series its nice an compact cost me 2000 rand which is about 120USD it was an overhauled unit.
The booster is only connected to the front brakes and now works really well. The foot pedal travels a bit to far but I think I just need to do some adjustments.
I installed the booster in the passenger side foot well because there is no space in the engine bay.
The photo was taken with the vacuum hose off because I was still trying to find the right hose. I still have not found the correct type of hose, for now I am using a garden hose but I am not showing a photo of that.
This is a photo of the engine bay.

Thanks for the replys.
The clutch pedal is no problem that easy to push.
I did not do the modification I bought the Datsun like this. I am trying to make it better.
Is it normal not to have a brake booster?

Sorry I must add that I have two master cylinders both 3/4 one for front one for back drums.
This issue with the hard pedal and poor stopping has always been like this since the brake modification.
The Rotors and calipers are both BMW.

Hi guys I am in need of help.
My 72 510 has BMW disks up front and standard drums at the back.
The master cylinders are 3/4''. There is no brake booster very basic system.
When I push the brake pedal the pedal is very hard and hardly moves however I can push as hard as I can the brakes do not lock they brake very poorly.
Do I need to install a brake booster, installing a brake booster will be very difficult because my engine bay is really full I have no space, the V8 takes up alot of room.